Flue cutter and expander



(No Model.)

W. D. HERVEY.

FLUE CUTTER AND EXPANDER.

Patented Nov. 23,1897.

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(NoModeL) v No. 594,081. I} Patented Nov 23, 1 97.

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W. D. HERVEY. FLUE CUTTER AND EXPANDER.

I W filtorney UNITED STATES PAT NT GFFICE.

WALTER D. HERVEY, OF OHENOA, ILLINOIS.

FLUE CUTTER AND EXPANDER.

SPECIFICATION forming part of Letters Patent No. 594,081, dated November23, 1897. Appli ation and February 12, 1897. erial No. 623,031. (Nomodel.)

To all whom it may concern.-

Be it known that I, WALTER D. HERVEY, a citizen of the United States,residing at Chenoa, in the county of McLean and State of Illinois, haveinvented certain new and useful Improvements in Flue Cutters andExpanders; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same. v

This invention relates to improvements in flue cutters and expanders,and has more particular relation to such devices as are interchangeable,so that they may be either made to cut or expand, at the will of theoperator.

The invention consists of certain novel constructions, combinations, andarrangements of parts, all of which will be hereinafter moreparticularly set forth and claimed.

. In the drawings forming part of this specification, Figure 1represents a perspective view of the device embodying my invention. Fig.2 represents a transverse vertical section through the same just forwardof the circular enlargement. Fig. 3 represents a detail perspective viewof the cutting-wheel. Fig. 4 represents a detail perspective View of theexpanding-wheel. Fig. 5 represents a side elevation o f-a modified formof my invention. Fig. 6 represents a transverse section through thesame, and Fig. 7 represents an enlarged detail perspective View of thelever and cutting-wheel.

A in the drawings represents the power shaft or shank; A, the circularenlargement formed thereon; B, the circular guide attached to one end ofsaid shaft; 0, the guide or gage, and D the operating-handle.

The circular enlargement A is formed with a segmental slot a, in whichthe cutting or expanding wheel, hereinafter described, is adapted totravel. Each wall of this slot is formed with a segmental cam-slot a,one end of each of said latter slots being at a greater distance fromthe periphery of the said enlargement A than the opposite end. Thecutting-wheel E preferably has a periphery beveled from one side only,so as to form a cutting edge c. This wheel is mounted in the slot C6 bymeans of trunnions e, with which it is provided, entering the respectivecamslots at. A guide-wheel B is journaled upon the reduced end a of theshaft A, so as to be capable of rotation thereon. The diameter of thisguide B, as well as the enlarged portion A, is just equal to theinternal diameter of the flue to be cut or expanded. vWhen this deviceis to be applied within a tube, it is slipped into the same until thegage-plate C,

which is adj ustablymounted upon the squared end a? of the shaft A,contacts with the outer surface of the head-plate, to which the tube issecured. This gage is secured in any desired position upon the squaredend of the shaft A by a set-screw c. Any suitable formofoperating-handle D is applied to the forward protruding end of theshaft A for operating the same.

It will be observed from the foregoing description that when it isdesired to cut out an old flue or tube from the boiler the device isinserted into the same and the shaft A rotated, the gage-plate B and theenlargement A acting as guides to keep the device central within thetube.

As the shaft A revolves the periphery of the cutting-wheel engages andcuts the interior of the tube, and as the cutting proceeds the trunnionse ride upon the inclined faces of the cam-slot a and thus graduallyproject the periphery of the cutting-Wheel more and more beyond theperiphery of the enlargement A until the tube has been cut through. Areverse operation of the shaft A will then cause the cutting-wheel tosink back into its normal position with its cutting periphery whollywithin the periphery of the enlargement A. The device can now bewithdrawn from the tube without interference from the cutting- Wheel.

When it is desired to expand a new tube in position in the head-plate,the operation is substantially the same as that just described, theexpanding-wheel F being inserted in the enlargement A in lieu of thewheel E. This expanding-wheel F comprises-a wheel proper,

, having a rounded periphery f and laterally-projecting trunnions f Itwill be observed that when this wheel is employed the.

rotation of the shaft A will cause it to press outward against theinterior of the tube and thus will expand the tube at this point andhold the same firmly in position in the head IOO plate. By means of thejournal connection between the inner end of the shaft A and the guide Bthe friction is greatly reduced, and the said guide can remain fixedwithin the tube while still permitting the rotation of the shaft.

In the modified form of myinvention shown in Figs. 5, 6, and 7 shaft Ais provided with an enlarged portion A made up of side apertured platesa and a central portion a cut away so as to form a segmental slot W. Thesaid central portion a is also provided with a transverse groove a soarranged as to be out of the true center of the two side plates a Thecutting-wheel a is rotatably mounted in the outer bifurcated end of theshort lever a The inner end of this lever is formed with an elongatedcircular head a that is slipped into the groove a before one of the sideplates a is applied in position, and is thus held in position by saidside plate after its application. It will be observed from thisdescription that the said lever a is pivoted eccentrically within theside plates a As said lever is operated the cuttingwheel will beprojected beyond the peripheries of the said plates a and cut or expandthe tube in substantially the same manner as heretofore described.

The several parts of this invention are very simple in construction andoperation and are capable of great power in cutting or expandingoperations as well as being interchangeable when so desired.

By the use of this device the old tubes may be removed from a boiler andnew ones inserted in a very short time and without any of the annoyancesusually incidental to this operation. The peculiar construction of theperiphery of the cutting-Wheels, which are beveled from one side only,enables this de'- vice to be operated with a shear out, which has beenfound mostdesirable in flue-cutters.

Having thus described my invention, What I claim as new, and desire tosecure by Letters Patent, is

1. In a flue cutter or expander, the combination with a power-shafthaving an enlargement formed with a segmental recess and segment-a1cam-slots in each wall of said recess, of a wheel adapted to operate insaid recess and having trunnions extending to opposite sides so as torest in the cam-slots, and means for operating the power-shaft,substantially as described.

2. In a flue cutter or expander, the combination with a power-shafthaving an enlargementformed with a segmental recess, and segmental slotsin each wall of said recess, of a wheel adapted to operate in saidrecess and having trunnions extending to opposite sides and mounted inthe cam-slots, a guide-plate mounted upon one end of said shaft, and anoperating-handle mounted upon the opposite end, substantially asdescribed.

3. In a flue cutter or expander, the combination with a power-shafthaving an enlargement formed with a segmental recess and segmentalcam-slots in each wall of said recess, of a wheel adapted to operate insaid recess, and having trunnions extending to opposite sides of thesame and mounted in the cam slots, an adjustable plate mounted on saidshaft, and an operating-handle also mounted on said shaft, substantiallyas described.

In testimony whereof I have signed this specification in the presence oftwo subscribing Witnesses.

WALTER D. HERVEY. \Vitnesses:

WILLIAM H. BENNETT, RosooE G. JORDAN.

